/**
 * jQuery lightBox plugin
 * This jQuery plugin was inspired and based on Lightbox 2 by Lokesh Dhakar (http://www.huddletogether.com/projects/lightbox2/)
 * and adapted to me for use like a plugin from jQuery.
 * @name jquery-lightbox-0.5.js
 * @author Leandro Vieira Pinho - http://leandrovieira.com
 * @version 0.5
 * @date April 11, 2008
 * @copyright (c) 2008 Leandro Vieira Pinho (leandrovieira.com)
 */

;(function($) {
    'use strict';

    function Gallery(elem, option) {
        var that = this;
        that.opts = jQuery.extend({}, Gallery.DEFAULT, option);
        //var elem = this;
        // Caching the jQuery object with all elements matched
        var jQueryMatchedObj = elem; // This, in this context, refer to jQuery object

        /**
         * Initializing the plugin calling the start function
         *
         * @return boolean false
         */
        function _initialize() {
            _start(this, jQueryMatchedObj); // This, in this context, refer to object (link) which the user have clicked
            return false; // Avoid the browser following the link
        }

        /**
         * Start the jQuery lightBox plugin
         *
         * @param {object} objClicked The object (link) whick the user have clicked
         * @param object jQueryMatchedObj The jQuery object with all elements matched
         */
        function _start(objClicked, jQueryMatchedObj) {
            // Hime some elements to avoid conflict with overlay in IE. These elements appear above the overlay.
            $('embed, object, select').css({ 'visibility' : 'hidden' });
            // Call the function to create the markup structure; style some elements; assign events in some elements.
            _view();
            // Unset total images in imageArray
            that.opts.imageArray.length = 0;
            // Unset image active information
            that.opts.activeImage = 0;
            // We have an image set? Or just an image? Let�s see it.
            if ( jQueryMatchedObj.length == 1 ) {
                that.opts.imageArray.push(new Array(objClicked.getAttribute('href'),objClicked.getAttribute('title')));
            } else {
                // Add an Array (as many as we have), with href and title atributes, inside the Array that storage the images references
                for ( var i = 0; i < jQueryMatchedObj.length; i++ ) {
                    that.opts.imageArray.push(new Array(jQueryMatchedObj[i].getAttribute('href'),jQueryMatchedObj[i].getAttribute('title')));
                }
            }
            while ( that.opts.imageArray[that.opts.activeImage][0] != objClicked.getAttribute('href') ) {
                that.opts.activeImage++;
            }
            // Call the function that prepares image exibition
            _set_image_to_view();
        }
        /**
         * Create the jQuery lightBox plugin interface
         */
        function _view() {
            // Apply the HTML markup into body tag
            $('body').append(
                '<div id="jquery-overlay"></div>' +
                '<div id="jquery-lightbox">' +
                '  <div id="lightbox-container-image-box">' +
                '    <div id="lightbox-container-image">' +
                '       <img id="lightbox-image">' +
                '       <div style="" id="lightbox-nav">' +
                '        <a href="#" id="lightbox-nav-btnPrev"><i class="' + that.opts.iconLeft + '"></i></a>' +
                '        <a href="#" id="lightbox-nav-btnNext"><i class="' + that.opts.iconRight + '"></i></a>' +
                '      </div>' +
                '      <div id="lightbox-loading">' +
                '        <a href="#" id="lightbox-loading-link">' +
                '          <i class="' + that.opts.iconLoading + '"></i>' +
                '        </a>' +
                '      </div>' +
                '    </div>' +
                '  </div>' +
                '  <div id="lightbox-container-image-data-box">' +
                '    <div id="lightbox-container-image-data">' +
                '      <div id="lightbox-image-details">' +
                '        <span id="lightbox-image-details-caption"></span>' +
                '        <span id="lightbox-image-details-currentNumber"></span>' +
                '      </div>' +
                '      <div id="lightbox-secNav">' +
                '        <a href="#" id="lightbox-secNav-btnClose"><i class="' + that.opts.iconClose + '"></i></a>' +
                '      </div>' +
                '    </div>' +
                '  </div>' +
                '</div>');
            // Get page sizes
            var arrPageSizes = Gallery._getPageSize();
            // Style overlay and show it
            $('#jquery-overlay').css({
                backgroundColor:	that.opts.overlayBgColor,
                opacity:			that.opts.overlayOpacity,
                width:				arrPageSizes[0],
                height:				arrPageSizes[1]
            }).fadeIn();
            // Get page scroll
            var arrPageScroll = Gallery._getPageScroll();
            // Calculate top and left offset for the jquery-lightbox div object and show it
            $('#jquery-lightbox').css({
                top:	arrPageScroll[1] + (arrPageSizes[3] / 10),
                left:	arrPageScroll[0]
            }).show();
            $('#lightbox-container-image-data').hide();
            _event();
        }

        function _event() {
            // Assigning click events in elements to close overlay
            $('#jquery-overlay,#jquery-lightbox').click(function() {
                _finish();
            });
            // Assign the _finish function to lightbox-loading-link and lightbox-secNav-btnClose objects
            $('#lightbox-loading-link,#lightbox-secNav-btnClose').click(function() {
                _finish();
                return false;
            });
            // If window was resized, calculate the new overlay dimensions
            $(window).resize(function() {
                // Get page sizes
                var arrPageSizes = Gallery._getPageSize();
                // Style overlay and show it
                $('#jquery-overlay').css({
                    width:		arrPageSizes[0],
                    height:		arrPageSizes[1]
                });
                // Get page scroll
                var arrPageScroll = Gallery._getPageScroll();
                // Calculate top and left offset for the jquery-lightbox div object and show it
                $('#jquery-lightbox').css({
                    top:	arrPageScroll[1] + (arrPageSizes[3] / 10),
                    left:	arrPageScroll[0]
                });
            });
        }

        /**
         * Prepares image exibition; doing a image�s preloader to calculate it�s size
         *
         */
        function _set_image_to_view() { // show the loading
            // Show the loading
            $('#lightbox-loading').show();
            if ( that.opts.fixedNavigation ) {
                $('#lightbox-image,#lightbox-container-image-data-box,#lightbox-image-details-currentNumber').hide();
            } else {
                // Hide some elements
                $('#lightbox-image,#lightbox-nav,#lightbox-nav-btnPrev,#lightbox-nav-btnNext,#lightbox-container-image-data-box,#lightbox-image-details-currentNumber').hide();
            }
            // Image preload process
            var objImagePreloader = new Image();
            objImagePreloader.onload = function() {
                $('#lightbox-image').attr('src',that.opts.imageArray[that.opts.activeImage][0]);
                // Perfomance an effect in the image container resizing it
                _resize_container_image_box(objImagePreloader.width,objImagePreloader.height);
                //	clear onLoad, IE behaves irratically with animated gifs otherwise
                objImagePreloader.onload=function(){};
            };
            objImagePreloader.src = that.opts.imageArray[that.opts.activeImage][0];
        }

        /**
         * Perfomance an effect in the image container resizing it
         *
         * @param integer intImageWidth The image�s width that will be showed
         * @param integer intImageHeight The image�s height that will be showed
         */
        function _resize_container_image_box(intImageWidth,intImageHeight) {
            // Get current width and height
            var intCurrentWidth = $('#lightbox-container-image-box').width();
            var intCurrentHeight = $('#lightbox-container-image-box').height();
            // Get the width and height of the selected image plus the padding
            var intWidth = (intImageWidth + (that.opts.containerBorderSize * 2)); // Plus the image�s width and the left and right padding value
            var intHeight = (intImageHeight + (that.opts.containerBorderSize * 2)); // Plus the image�s height and the left and right padding value
            // Diferences
            var intDiffW = intCurrentWidth - intWidth;
            var intDiffH = intCurrentHeight - intHeight;
            // Perfomance the effect
            $('#lightbox-container-image-box').animate({ width: intWidth, height: intHeight },that.opts.containerResizeSpeed,function() { _show_image(); });
            if ( ( intDiffW == 0 ) && ( intDiffH == 0 ) ) {
                if ( $.browser.msie ) {
                    Gallery._pause(250);
                } else {
                    Gallery._pause(100);
                }
            }
            $('#lightbox-container-image-data-box').css({ width: intImageWidth });
            $('#lightbox-nav-btnPrev,#lightbox-nav-btnNext').css({ height: intImageHeight + (that.opts.containerBorderSize * 2) });
        }

        /**
         * Show the prepared image
         *
         */
        function _show_image() {
            $('#lightbox-loading').hide();
            $('#lightbox-image').fadeIn(function() {
                _show_image_data();
                _set_navigation();
            });
            _preload_neighbor_images();
        }

        /**
         * Show the image information
         *
         */
        function _show_image_data() {
            $('#lightbox-container-image-data-box').slideDown('fast');
            $('#lightbox-image-details-caption').hide();
            if ( that.opts.imageArray[that.opts.activeImage][1] ) {
                $('#lightbox-image-details-caption').html(that.opts.imageArray[that.opts.activeImage][1]).show();
            }
            // If we have a image set, display 'Image X of X'
            if ( that.opts.imageArray.length > 1 ) {
                $('#lightbox-image-details-currentNumber').html(that.opts.txtImage + ' ' + ( that.opts.activeImage + 1 ) + ' ' + that.opts.txtOf + ' ' + that.opts.imageArray.length).show();
            }
        }
        /**
         * Display the button navigations
         *
         */
        function _set_navigation() {
            $('#lightbox-nav').show();

            // Instead to define this configuration in CSS file, we define here. And it�s need to IE. Just.

            // Show the prev button, if not the first image in set
            if ( that.opts.activeImage != 0 ) {
                if ( that.opts.fixedNavigation ) {
                    $('#lightbox-nav-btnPrev').find('.icon').show();
                    $('#lightbox-nav-btnPrev').unbind()
                        .bind('click',function() {
                            that.opts.activeImage = that.opts.activeImage - 1;
                            _set_image_to_view();
                            return false;
                        });
                } else {
                    // Show the images button for Next buttons
                    $('#lightbox-nav-btnPrev').unbind().hover(function() {
                        $(this).find('.icon').show();
                    },function() {
                        $(this).find('.icon').hide();
                    }).show().on('click',function() {
                        that.opts.activeImage = that.opts.activeImage - 1;
                        _set_image_to_view();
                        return false;
                    });
                }
            }

            // Show the next button, if not the last image in set
            if ( that.opts.activeImage != ( that.opts.imageArray.length -1 ) ) {
                if ( that.opts.fixedNavigation ) {
                    $('#lightbox-nav-btnNext').find('.icon').show();
                    $('#lightbox-nav-btnNext').unbind()
                        .bind('click',function() {
                            that.opts.activeImage = that.opts.activeImage + 1;
                            _set_image_to_view();
                            return false;
                        });
                } else {
                    // Show the images button for Next buttons
                    $('#lightbox-nav-btnNext').unbind().hover(function() {
                        $(this).find('.icon').show();
                    },function() {
                        $(this).find('.icon').hide();
                    }).show().bind('click',function() {
                        that.opts.activeImage = that.opts.activeImage + 1;
                        _set_image_to_view();
                        return false;
                    });
                }
            }
            // Enable keyboard navigation
            _enable_keyboard_navigation();
        }
        /**
         * Enable a support to keyboard navigation
         *
         */
        function _enable_keyboard_navigation() {
            $(document).keydown(function(objEvent) {
                _keyboard_action(objEvent);
            });
        }
        /**
         * Disable the support to keyboard navigation
         *
         */
        function _disable_keyboard_navigation() {
            $(document).unbind();
        }
        /**
         * Perform the keyboard actions
         *
         */
        function _keyboard_action(objEvent) {
            var keycode;
            var escapeKey;

            // To ie
            if ( objEvent == null ) {
                keycode = event.keyCode;
                escapeKey = 27;
                // To Mozilla
            } else {
                keycode = objEvent.keyCode;
                escapeKey = objEvent.DOM_VK_ESCAPE;
            }
            // Get the key in lower case form
            key = String.fromCharCode(keycode).toLowerCase();
            // Verify the keys to close the ligthBox
            if ( ( key == that.opts.keyToClose ) || ( key == 'x' ) || ( keycode == escapeKey ) ) {
                _finish();
            }
            // Verify the key to show the previous image
            if ( ( key == that.opts.keyToPrev ) || ( keycode == 37 ) ) {
                // If we�re not showing the first image, call the previous
                if ( that.opts.activeImage != 0 ) {
                    that.opts.activeImage = that.opts.activeImage - 1;
                    _set_image_to_view();
                    _disable_keyboard_navigation();
                }
            }
            // Verify the key to show the next image
            if ( ( key == that.opts.keyToNext ) || ( keycode == 39 ) ) {
                // If we�re not showing the last image, call the next
                if ( that.opts.activeImage != ( that.opts.imageArray.length - 1 ) ) {
                    that.opts.activeImage = that.opts.activeImage + 1;
                    _set_image_to_view();
                    _disable_keyboard_navigation();
                }
            }
        }
        /**
         * Preload prev and next images being showed
         *
         */
        function _preload_neighbor_images() {
            if ( (that.opts.imageArray.length -1) > that.opts.activeImage ) {
                var objNext = new Image();
                objNext.src = that.opts.imageArray[that.opts.activeImage + 1][0];
            }
            if ( that.opts.activeImage > 0 ) {
                var objPrev = new Image();
                objPrev.src = that.opts.imageArray[that.opts.activeImage -1][0];
            }
        }

        /** 关闭图片预览 */
        function _finish() {
            $('#jquery-lightbox').remove();
            $('#jquery-overlay').fadeOut(function() { $('#jquery-overlay').remove(); });
            // Show some elements to avoid conflict with overlay in IE. These elements appear above the overlay.
            $('embed, object, select').css({ 'visibility' : 'visible' });
        }

        // Return the jQuery object for chaining. The unbind method is used to avoid click conflict when the plugin is called more than once
        return elem.unbind('click').click(_initialize);
    }

    Gallery.DEFAULT = {
        // Configuration related to overlay
        overlayBgColor: 		'#000',		// (string) Background color to overlay; inform a hexadecimal value like: #RRGGBB. Where RR, GG, and BB are the hexadecimal values for the red, green, and blue values of the color.
        overlayOpacity:			0.8,		// (integer) Opacity value to overlay; inform: 0.X. Where X are number from 0 to 9
        // Configuration related to navigation
        fixedNavigation:		false,		// (boolean) Boolean that informs if the navigation (next and prev button) will be fixed or not in the interface.
        // 图标类
        iconClose: 'icon icon-close',
        iconLeft: 'icon icon-left',
        iconRight: 'icon icon-right',
        iconLoading: 'icon icon-loading icon-spin',
        // Configuration related to images
        imageBtnClose:			'images/lightbox-btn-close.gif',		// (string) Path and the name of the close btn
        // Configuration related to container image box
        containerBorderSize:	10,			// (integer) If you adjust the padding in the CSS for the container, #lightbox-container-image-box, you will need to update this value
        containerResizeSpeed:	400,		// (integer) Specify the resize duration of container image. These number are miliseconds. 400 is default.
        // Configuration related to texts in caption. For example: Image 2 of 8. You can alter either "Image" and "of" texts.
        txtImage:				'Image',	// (string) Specify text "Image"
        txtOf:					'of',		// (string) Specify text "of"
        // Configuration related to keyboard navigation
        keyToClose:				'c',		// (string) (c = close) Letter to close the jQuery lightBox interface. Beyond this letter, the letter X and the SCAPE key is used to.
        keyToPrev:				'p',		// (string) (p = previous) Letter to show the previous image
        keyToNext:				'n',		// (string) (n = next) Letter to show the next image.
        // Don�t alter these variables in any way
        imageArray:				[],
        activeImage:			0
    };

    Gallery.pt = Gallery.prototype;

    /**
     / THIRD FUNCTION
     * getPageScroll() by quirksmode.com
     *
     * @return Array Return an array with x,y page scroll values.
     */
    Gallery._getPageScroll = function () {
        var xScroll, yScroll;
        if (self.pageYOffset) {
            yScroll = self.pageYOffset;
            xScroll = self.pageXOffset;
        } else if (document.documentElement && document.documentElement.scrollTop) {	 // Explorer 6 Strict
            yScroll = document.documentElement.scrollTop;
            xScroll = document.documentElement.scrollLeft;
        } else if (document.body) {// all other Explorers
            yScroll = document.body.scrollTop;
            xScroll = document.body.scrollLeft;
        }
        return [xScroll,yScroll];
    }

    /**
     * Stop the code execution from a escified time in milisecond
     *
     */
    Gallery._pause = function (ms) {
        var date = new Date();
        curDate = null;
        do { var curDate = new Date(); }
        while ( curDate - date < ms);
    }

    /**
     / THIRD FUNCTION
     * getPageSize() by quirksmode.com
     *
     * @return Array Return an array with page width, height and window width, height
     */
    Gallery._getPageSize = function () {
        var xScroll, yScroll;
        if (window.innerHeight && window.scrollMaxY) {
            xScroll = window.innerWidth + window.scrollMaxX;
            yScroll = window.innerHeight + window.scrollMaxY;
        } else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
            xScroll = document.body.scrollWidth;
            yScroll = document.body.scrollHeight;
        } else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
            xScroll = document.body.offsetWidth;
            yScroll = document.body.offsetHeight;
        }
        var windowWidth, windowHeight;
        if (self.innerHeight) {	// all except Explorer
            if(document.documentElement.clientWidth){
                windowWidth = document.documentElement.clientWidth;
            } else {
                windowWidth = self.innerWidth;
            }
            windowHeight = self.innerHeight;
        } else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
            windowWidth = document.documentElement.clientWidth;
            windowHeight = document.documentElement.clientHeight;
        } else if (document.body) { // other Explorers
            windowWidth = document.body.clientWidth;
            windowHeight = document.body.clientHeight;
        }

        var pageWidth;
        var pageHeight;

        // for small pages with total height less then height of the viewport
        if(yScroll < windowHeight){
            pageHeight = windowHeight;
        } else {
            pageHeight = yScroll;
        }
        // for small pages with total width less then width of the viewport
        if(xScroll < windowWidth){
            pageWidth = xScroll;
        } else {
            pageWidth = windowWidth;
        }
        return [pageWidth,pageHeight,windowWidth,windowHeight];
    };

    function Plugin(option) {
        new Gallery(this, option);
    }

	$.fn.gallery = Plugin;

    window.eui = window.eui || {};
    window.eui.Gallery = Gallery;
})(jQuery);